On 01/12/2024 23:55, Frederick Virchanza Gotham via Gcc wrote:
Some modern CPU's now have control flow enforcement. Here's how it
works on Intel CPU's:
"The shadow stack stores a copy of the return address of each CALL. On
a RET, the processor checks if the return address stored in the normal
st
On 28/11/2024 12:18, Aaron Peter Bachmann via Gcc wrote:
Two suggestions for GCC beginners projects
I watched some of the 2024 Gnu Cauldron videos. The question of what
could be a suitable project for a beginner came up. I have two suggestions:
1. Add a warning when users use reserved or p
On 13/11/2024 22:34, James K. Lowden wrote:
On Thu, 14 Nov 2024 10:04:59 +0100
David Brown via Gcc wrote:
No. This is - or at least appears to be - missing critical thinking.
You are explaining this to someone who designed research databases and
who implemented quantitative models that ran
On 12/11/2024 22:44, James K. Lowden wrote:
On Tue, 12 Nov 2024 18:12:50 +0100
David Brown via Gcc wrote:
Under what circumstances would you have code that :
...
d) Would be perfectly happy with "x" having the value 2.225e-307 (or
perhaps a little larger) and doing the division
On 12/11/2024 15:29, Sad Clouds via Gcc wrote:
On Mon, 11 Nov 2024 21:14:43 + (UTC)
Joseph Myers wrote:
I don't think this has anything to do with whether one operand of the
comparison is a constant. It's still the case when comparing with 0.0
that it's OK if your algorithm is designed su
On 24/10/2024 16:35, Jonathan Wakely via Gcc wrote:
On Thu, 24 Oct 2024 at 15:00, Mateusz Guzik via Gcc wrote:
I understand the stock behavior of pilling variables on may happen to
improve cache usage.
However, in a multicore setting it is a never-ending source of
unintentionally showing up a
On 27/09/2024 10:13, Dennis Luehring via Gcc wrote:
Am 27.09.2024 um 09:56 schrieb Jonathan Wakely:
On Fri, 27 Sept 2024, 08:39 Dennis Luehring, wrote:
> Am 27.09.2024 um 09:34 schrieb Jonathan Wakely:
>
>
> > They might not have
> > been using the original gcc-3.4.0 sources.
>
>
> seems to be
On 23/09/2024 22:09, Andrew Pinski via Gcc wrote:
While working on the review from
https://gcc.gnu.org/pipermail/gcc-patches/2024-September/663418.html .
I noticed that there are places which use `side effects` and some use
`side-effects`. I assume we should follow a similar pattern as
`back-end`
On 11/07/2024 11:58, Martin Uecker via Gcc wrote:
Am Donnerstag, dem 11.07.2024 um 11:35 +0200 schrieb Alejandro Colomar via Gcc:
Hi,
I was wondering how we could extend attributes such as gnu::access() to
apply it to pointees too. Currently, there's no way to specify the
access mode of a poi
On 04/06/2024 19:43, Michael Matz via Gcc wrote:
Hello,
On Tue, 4 Jun 2024, Richard Biener wrote:
A pragmatic solution might be a new target hook, indicating a specified
builtin is not to be folded into an open-coded form.
Well, that's what the mechanism behind -fno-builtin-foobar is suppose
On 30/05/2024 04:26, Andrew Pinski via Gcc wrote:
On Wed, May 29, 2024 at 7:13 PM 赵海峰 via Gcc wrote:
Dear Sir/Madam,
We found that running on intel SPR UnixBench compiled with gcc 10.3 performs
worse than with gcc 8.5 for dhry2reg benchmark.
I found it related with -fcommon option which i
On 18/03/2024 14:54, Andreas Schwab via Gcc wrote:
On Mär 18 2024, David Brown wrote:
I think it would be possible to have an implementation where "signed
char" was 8-bit two's complement except that 0x80 would be a trap
representation rather than -128.
signed char cannot have padding bits, t
Hi,
First, please ignore everything Dave Blanchard writes. I don't know
why, but he likes to post angry, rude and unhelpful messages to this list.
Secondly, this is the wrong list. gcc-help would be the correct list,
as you are asking for help with gcc. This list is for discussions on
the
On 02/11/2023 00:28, peter0x44 via Gcc wrote:
On 2023-11-01 23:13, Joseph Myers wrote:
On Wed, 1 Nov 2023, peter0x44 via Gcc wrote:
Why is #define used instead of typedef? I can't imagine how this could
possibly break any existing code.
That's how stdbool.h is specified up to C17. In C23,
On 11/10/2023 12:17, Florian Weimer wrote:
* David Brown:
On 11/10/2023 10:10, Florian Weimer wrote:
* David Brown:
So IMHO (and as I am not a code contributor to GCC, my opinion really
is humble) it is better to be stricter than permissive, even in old
standards. It is particularly impo
On 11/10/2023 10:10, Florian Weimer wrote:
* David Brown:
So IMHO (and as I am not a code contributor to GCC, my opinion really
is humble) it is better to be stricter than permissive, even in old
standards. It is particularly important for "-std=c89", while
"-std=gnu89" is naturally more pe
On 10/10/2023 18:30, Jason Merrill via Gcc wrote:
On Tue, Oct 10, 2023 at 7:30 AM Florian Weimer via Gcc
wrote:
Are these code fragments valid C89 code?
int i1 = 1;
char *p1 = i;
char c;
char *p2 = &c;
int i2 = p2;
Or can we generate errors for them even with -std=gnu89?
(It
On 12/07/2023 14:43, Jonathan Wakely via Gcc wrote:
On Wed, 12 Jul 2023 at 10:25, Vishal B Patil via Gcc wrote:
Hi Team,
Any updates ?
You're not going to get any useful answers.
You asked "Please share the costs and time as well." Costs for what? From whom?
GCC is an open-source project
On 07/07/2023 00:27, André Albergaria Coelho via Gcc wrote:
What if the user chooses in own ABI, say specifying a config file like
My abi
" Parameters = pushed in stack"
say
gcc -abi "My abi" some.c -o some
what would be the problems of specifying an ABI?? would that improve the
usage of u
On 06/07/2023 09:00, Rafał Pietrak via Gcc wrote:
Hi,
W dniu 5.07.2023 o 19:39, David Brown pisze:
[--]
I'm not sure what this means? At compile time, you only have
literals, so what's missing?
The compiler knows a lot more than just literal values at compile time
- lots of t
On 05/07/2023 18:13, Rafał Pietrak via Gcc wrote:
Hi,
W dniu 5.07.2023 o 16:45, David Brown pisze:
On 05/07/2023 15:29, Rafał Pietrak wrote:
[---]
OK. I don't see a problem here, but I admit that mixing semantics
often lead to problems.
I think it also allows better generalisa
On 05/07/2023 15:29, Rafał Pietrak wrote:
Hi,
W dniu 5.07.2023 o 14:57, David Brown pisze:
[]
My objection to named address spaces stem from two points:
1. They are compiler implementations, not user code (or library code),
which means development is inevitably much slower and l
On 05/07/2023 14:25, Rafał Pietrak wrote:
Hi,
W dniu 5.07.2023 o 13:55, David Brown pisze:
On 05/07/2023 11:42, Rafał Pietrak via Gcc wrote:
[--]
So your current objections to named spaces ... are in fact in favor
of them. Isn't it so?
Not really, no - I would rather see b
On 05/07/2023 11:42, Rafał Pietrak via Gcc wrote:
Hi,
W dniu 5.07.2023 o 11:11, David Brown pisze:
On 05/07/2023 10:05, Rafał Pietrak via Gcc wrote:
[---]
I am not sure if you are clear about this, but the address space
definition macros here are for use in the source code for the
On 05/07/2023 11:25, Martin Uecker wrote:
Am Mittwoch, dem 05.07.2023 um 11:11 +0200 schrieb David Brown:
On 05/07/2023 10:05, Rafał Pietrak via Gcc wrote:
...
In my personal opinion (which you are all free to disregard), named
address spaces were an interesting idea that failed. I was
e
On 05/07/2023 10:05, Rafał Pietrak via Gcc wrote:
Hi,
W dniu 5.07.2023 o 09:29, Martin Uecker pisze:
Am Mittwoch, dem 05.07.2023 um 07:26 +0200 schrieb Rafał Pietrak:
[---]
And if it's so ... there is no mention of how does it show up for
"simple user" of the GCC (instead of the use of th
On 04/07/2023 16:46, Rafał Pietrak wrote:
Hi,
W dniu 4.07.2023 o 14:38, David Brown pisze:
[-]
A key difference is that using 32-bit pointers on an x86 is enough
address space for a large majority of use-cases, while even on the
smallest small ARM microcontroller, 16-bit is not enough.
On 04/07/2023 16:20, Rafał Pietrak wrote:
W dniu 3.07.2023 o 18:29, Rafał Pietrak pisze:
Hi David,
[--]
4. It is worth taking a step back, and thinking about how you would
like to use these pointers. It is likely that you would be better
thinking in terms of an array, rather t
On 03/07/2023 18:42, Rafał Pietrak via Gcc wrote:
Hi Ian,
W dniu 3.07.2023 o 17:07, Ian Lance Taylor pisze:
On Wed, Jun 28, 2023 at 11:21 PM Rafał Pietrak via Gcc
wrote:
[]
I was thinking about that, and it doesn't look as requiring that deep
rewrites. ABI spec, that could accomodat
On 28/06/2023 10:35, Rafał Pietrak via Gcc wrote:
Hi Jonathan,
W dniu 28.06.2023 o 09:31, Jonathan Wakely pisze:
If you use a C++ library type for your pointers the syntax above
doesn't need to change, and the fancy pointer type can be implemented
portable, with customisation for targets w
On 06/06/2023 14:53, Paul Smith wrote:
On Tue, 2023-06-06 at 16:36 +0800, Julian Waters via Gcc wrote:
Sorry for my outburst, to the rest of this list. I can no longer stay
silent and watch these little shits bully people who are too kind to
fire back with the same kind of venom in their words.
On 06/06/2023 02:09, Dave Blanchard wrote:
If this guy's threads are such a terrible waste of your time, how
about employing your email client's filters to ignore his posts (and
mine too) and fuck off?
You apparently appreciate Stefan's posts, but burst a blood vessel when
reading anyone els
On 26/05/2023 17:49, Stefan Kanthak wrote:
I don't like to argue with idiots: they beat me with experience!
Stefan
Stefan, you are clearly not happy about the /free/ compiler you are
using, and its /free/ documentation (which, despite its flaws, is better
than I have seen for most other co
On 12/05/2023 08:16, Richard Biener via Gcc wrote:
On Thu, May 11, 2023 at 11:14 PM Kees Cook via Gcc wrote:
On Thu, May 11, 2023 at 08:53:52PM +, Joseph Myers wrote:
On Thu, 11 May 2023, Kees Cook via Gcc wrote:
On Thu, May 11, 2023 at 06:29:10PM +0200, Alejandro Colomar wrote:
On 5/1
On 12/05/2023 04:08, Po Lu via Gcc wrote:
Eli Schwartz writes:
Because that's exactly what is going on here. Features that were valid
C89 code are being used in a GNU99 or GNU11 code file, despite that
***not*** being valid GNU99 or GNU11 code.
How GCC currently behaves defines what is va
On 11/05/2023 04:09, Po Lu via Gcc wrote:
jwakely@gmail.com (Jonathan Wakely) writes:
So let's do it. Let's write a statement saying that the GCC developers
consider software security to be of increasing importance, and that we
consider it irresponsible to default to accepting invalid const
On 10/05/2023 16:39, Eli Zaretskii via Gcc wrote:
Date: Wed, 10 May 2023 15:30:02 +0200
From: David Brown via Gcc
If some developers want to ignore warnings, it is not the business of
GCC to improve them, even if you are right in assuming that they will
not work around errors like they work
On 10/05/2023 16:14, Eli Zaretskii via Gcc wrote:
Date: Wed, 10 May 2023 14:41:27 +0200
Cc: jwakely@gmail.com, fwei...@redhat.com, gcc@gcc.gnu.org,
ar...@aarsen.me
From: Gabriel Ravier
Because GCC is capable of compiling it.
That is not a good argument. GCC is capable of compiling any
On 10/05/2023 15:10, Basile Starynkevitch wrote:
Hello all,
After a suggestion by Eric Gallager
Idea for a compromise: What if, instead of flipping the switch on all
3 of these at once, we staggered them so that each one becomes a
default in a separate release? i.e., something like:
- GCC 14:
On 10/05/2023 14:22, Eli Zaretskii via Gcc wrote:
From: Jonathan Wakely
Date: Wed, 10 May 2023 12:49:52 +0100
Cc: David Brown , gcc@gcc.gnu.org
If some developers want to ignore warnings, it is not the business of
GCC to improve them, even if you are right in assuming that they will
not work a
On 09/05/2023 22:13, David Edelsohn via Gcc wrote:
On Tue, May 9, 2023 at 3:22 PM Eli Zaretskii via Gcc
wrote:
Date: Tue, 9 May 2023 21:07:07 +0200
From: Jakub Jelinek
Cc: Jonathan Wakely , ar...@aarsen.me,
gcc@gcc.gnu.org
On Tue, May 09, 2023 at 10:04:06PM +0300, Eli Zaretskii via Gcc wro
On 09/05/2023 21:04, Eli Zaretskii via Gcc wrote:
From: Jonathan Wakely
Date: Tue, 9 May 2023 18:15:59 +0100
Cc: Arsen Arsenović , gcc@gcc.gnu.org
On Tue, 9 May 2023 at 17:56, Eli Zaretskii wrote:
No one has yet explained why a warning about this is not enough, and
why it must be made an erro
On 14/11/2022 16:10, NightStrike wrote:
On Mon, Nov 14, 2022, 04:42 David Brown via Gcc
Warnings are not perfect - there is always the risk of false positives
and false negatives. And different people will have different ideas
about what code is perfectly reasonable, and
On 13/11/2022 19:43, Alejandro Colomar via Gcc wrote:
Hi Andrew!
On 11/13/22 19:41, Andrew Pinski wrote:
On Sun, Nov 13, 2022 at 10:40 AM Andrew Pinski wrote:
On Sun, Nov 13, 2022 at 10:36 AM Alejandro Colomar via Gcc
wrote:
Hi,
While discussing some idea for a new feature, I tested the
On 10/11/2022 20:16, Florian Weimer via Gcc wrote:
* Marek Polacek:
On Thu, Nov 10, 2022 at 07:25:21PM +0100, Florian Weimer via Gcc wrote:
GCC accepts various conversions between pointers and ints and different
types of pointers by default, issuing a warning.
I've been reading the (hopefully
On 03/11/2022 16:19, Michael Matz via Gcc wrote:
Hello,
On Thu, 3 Nov 2022, Florian Weimer via Gcc wrote:
will not have propagated widely once GCC 13 releases, so rejecting
implicit ints in GCC 13 might be too early. GCC 14 might want to switch
to C23/C24 mode by default, activating auto supp
On 05/07/2022 09:19, Yair Lenga via Gcc wrote:
Hi,
Wanted to get some feedback on an idea that I have - trying to address the
age long issue with type check on VA list function - like 'scanf' and
friends. In my specific case, I'm trying to build code that will parse a
list of values from SELECT
47 matches
Mail list logo
